An adaptable parallel algorithm for the direct numerical simulation of incompressible turbulent flows using a Fourier spectral/hp element method and MPI virtual topologies.
An adaptable parallel algorithm for the direct numerical simulation of incompressible turbulent flows using a Fourier spectral/hp element method and MPI virtual topologies.
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DOI：
10.1016/j.cpc.2016.04.011
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发表时间：
2016-09
影响因子：
6.3
通讯作者：
Sherwin SJ
中科院分区：
文献类型：
--
作者：
Bolis A;Cantwell CD;Moxey D;Serson D;Sherwin SJ
研究了一种用于分布式存储系统的混合并行化技术，用于一个或多个方向上具有几何均匀性的域的耦合傅立叶-谱/hp元离散化。该方法的性能根据操作次数和通信成本进行数学建模，以确定最有效的参数选择。该模型被校准为针对特定的硬件平台，之后它被证明可以准确地预测混合状态下的性能。将该方法应用于用不可压缩的Navier-Stokes方程模拟轴对称管道和方形通道中的湍流。混合方法扩展了离散化的实际限制，允许更大的并行性并减少钻壁时间。当使用这两种并行化策略时，性能会继续扩展。
A hybrid parallelisation technique for distributed memory systems is investigated for a coupled Fourier-spectral/hp element discretisation of domains characterised by geometric homogeneity in one or more directions. The performance of the approach is mathematically modelled in terms of operation count and communication costs for identifying the most efficient parameter choices. The model is calibrated to target a specific hardware platform after which it is shown to accurately predict the performance in the hybrid regime. The method is applied to modelling turbulent flow using the incompressible Navier–Stokes equations in an axisymmetric pipe and square channel. The hybrid method extends the practical limitations of the discretisation, allowing greater parallelism and reduced wall times. Performance is shown to continue to scale when both parallelisation strategies are used.